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[Chemical Knowledge]：The manufacturing method and process of AA.

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AA (Acrylic Acid) Manufacturing Method

1. Introduction

Acrylic Acid (AA) is an important organic chemical raw material, widely used in the production of various polymers, coatings, adhesives, fibers and other fields. Therefore, it is of great significance to study the manufacturing method of AA for improving production efficiency, reducing costs and improving product quality. This article will introduce the manufacturing method of AA, including raw material preparation, reaction process, post-treatment and so on.

2. Raw Material Preparation

1. Propylene: Propylene is the main raw material for the manufacture of acrylic acid, requiring high purity, generally requiring purity above 99.5%.
2. Catalyst: Commonly used catalysts include acid catalysts such as sulfuric acid and phosphoric acid, and oxide catalysts such as zirconium oxide and bismuth oxide. Different catalysts have different effects on the reaction and need to be selected according to the actual situation.
3. Oxidant: Commonly used oxidants are air, oxygen, etc., of which oxygen is more commonly used.

3. reaction process

1. Propylene oxidation reaction: After mixing propylene, catalyst and oxidant, the oxidation reaction is carried out under high temperature and high pressure conditions to generate acrylic acid and by-products. The reaction equation is: CH2 = CH-CH3 +1/2 O2 → CH2 = CH-COOH + H2O
2. Regeneration of the catalyst: After the reaction is completed, the catalyst needs to be regenerated for recycling. Generally, carbon deposition and other impurities in the catalyst are burned off by high temperature calcination to restore the activity of the catalyst.

4. post-treatment

1. cooling crystallization: the reaction liquid is cooled to a certain temperature, so that acrylic acid crystal precipitation, in order to obtain a higher purity of acrylic acid products.
2. Centrifugation: The crystallized acrylic acid was separated from the mother liquor by a centrifuge to obtain a solid acrylic acid product.
3. Dry packaging: After the solid acrylic acid product is dried, it is packaged to obtain the final acrylic acid product.

5. precautions

1. control the reaction temperature and pressure to ensure the smooth progress of the reaction, while avoiding the formation of by-products.
2. The choice and use of catalyst has a great influence on the reaction, and it needs to be selected and used according to the actual situation.
3. In the post-treatment process, it is necessary to control the temperature and time of cooling crystallization to ensure the purity and yield of the product.

6. conclusion

acrylic acid as an important organic chemical raw material, its manufacturing method is of great significance for improving production efficiency, reducing costs and improving product quality. In the actual production process, it is necessary to control the process parameters of each link such as raw material preparation, reaction process and post-treatment to ensure the quality and yield of the product.

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